Net 6 Anonymous Types Asp.Net Async Async Await Automapper Azure Blob Storage Azure Functions Azure Table Storage Benchmark Best Practices C# C# 7.x C# 8 C# 10 Caliburn Micro Circuit Breaker Code Smell Container Debugging Dependency Property Deserialize Design Pattern Design Principle Docker Docker Compose Docker Concepts EcSolvo.RestHelper Entity Framework Event Aggregators EvilCode Exception Handling Extension Methods Firebird Form Validation Generics GoF gRPC HLSL IEnumerable JSON LINQ Microservice Mobile MongoDb MVC MVVM Newtonsoft. Install Extensions in Postgres Docker container.Child Component Validation using Vuelidate.The complete code sample is available in my Github here. That’s all you need for Validating your ViewModels using DataAnnotationAttribute and INotifyDataErrorInfo. ASP. Return _errors.ContainsKey(propertyName) ? _errors : null Public IEnumerable GetErrors(string propertyName) _errors = results.Select(x => x.ErrorMessage).ToList() ĮrrorsChanged?.Invoke(this, new DataErrorsChangedEventArgs(propertyName)) If (!Validator.TryValidateProperty(val, context, results)) ValidationContext context = new ValidationContext(_model) We can quickly apply validation with the help of data annotation attribute classes over model classes. In ASP.NET MVC, Data Annotation is used for data validation for developing web-based applications. here i am posting my view along with model. Company Name should be less than or equal to five characters. Please tell me why ComponentModel.DataAnnotations is not working here i have done every thing but in vain so tell me where i have mistakes in this code. If (_errors.ContainsKey(propertyName)) _errors.Remove(propertyName) Enabling Client-Side Validation in ASP.NET MVC Application. to understand how you can use DataAnnotation attributes for validation of model data. Private void Validate(object val, string propertyName = null) Public string Title => "Data Annotation and INotifyDataErrorInfo" Private IDictionary> _errors = new Dictionary>() Public class DataAnnotionViewModel : ViewModelBase, INotifyDataErrorInfo The INotifyDataErrorInfo is defined as following. Well use the following Data Annotation attributes: Required Indicates that the property is a required field. The next task obiovusly would be to implement the INotifyDataErrorInfo property in your ViewModel. Additionally I have also used ErrorTemplate to display the error but that is more of an implementation detail for this particular demo, you could opt for the default template or choose another that suits your needs. The most significant part here is of course the property ValidatesOnNotifyDataErrors being set to true.
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